Vast New Intelligence Haul Fuels Next Phase of Fight Against Islamic State

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U.S. intelligence analysts have gained valuable insights into Islamic State’s planning and personnel from a vast cache of digital data and other material recovered from bombed-out offices, abandoned laptops and the cellphones of dead fighters in recently liberated areas of Iraq and Syria.

In the most dramatic gain, U.S. officials over the last two months have added thousands of names of known or suspected Islamic State operatives to an international watch list used at airports and other border crossings. The Interpol database now contains about 19,000 names.

The intelligence haul — the largest since U.S. forces entered the war in mid-2014 — threatens to overwhelm already stretched counter-terrorism and law enforcement agencies in Europe, where Islamic State has claimed responsibility for attacks in Paris, London and Stockholm this year.

With the extremist group’s army and self-declared caliphate fast shrinking, U.S. officials are concerned that foreign-born militants who once flocked to Iraq and Syria will try to escape before the U.S.-led coalition or other military forces can kill them…